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<div class="foo bar" id="header"></div>
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<div data-prettier></div>
<div data-prettier="true"></div>
<meta property="og:description" content="The Mozilla Developer Network (MDN) provides
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<div attribute>String</div>
<div attribute="">String</div>
<div attribute=''>String</div>
<div attribute >String</div>
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<div attribute = '' >String</div>
<div  attribute  >String</div>
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<div attribute="attribute = attribute"></div>
<div ATTRIBUTE>String</div>
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<div ATTRIBUTE=''>String</div>
<article
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</article>
<article
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<article
  id="electriccars"
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  ...
</article>
<article
  id="electriccars"
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</article>
<article
  id="electriccars"
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</article>
<X>
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<X a="1" b="2" c="3">
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<p 
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